Memory is a kind of accomplishment, a sort of renewal even.

Coal will remain a vital energy source, but only if we evolve with the times.

History is, above all else, the creation and recording of that heritage; progress is its increasing abundance, preservation, transmission, and use.

思考就是将自己局限于一个单一的思想。

生活中唯一的限制是你为自己设定的限制。